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The value of ∞∫0 x^2n+1.e^-x2 dx is (n ∈ W)

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The value of ∞∫0 x2n+1.e-x2 dx is (n ∈ W)

(A) n! 

(B) 2.n! 

(C) (n+1) ! /2  

(D) n ! 2

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Correct Option :- (D)

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